<template>
    <form class="validate-form-container">  
        <slot name="default"></slot>
        <div class="submit-area" @click.prevent="submitForm">
            <slot name="submit">
                <button type="submit" class="btn btn-primary">提交</button>
            </slot>
        </div>
    </form>
</template>

<script lang="ts">
import { defineComponent, onUnmounted } from "vue";
import mitt from 'mitt'
// type Events = {
//     'form-item-created': string
// }
type ValidateFunc = () => boolean
export const emitter = mitt()
export default defineComponent({
    emits: ['form-submit'],
    setup (props,context) {
        let funcArr: ValidateFunc[] = []
        const submitForm = () => {
            const result = funcArr.map(func => func()).every((result) => result)
            context.emit('form-submit',  result)
        }
        const callback = (func?: ValidateFunc) => {
            if(func) {
                funcArr.push(func)
            }
        }
        emitter.on('form-item-created', callback)
        onUnmounted(() => {
            emitter.off('form-item-created', callback)
            funcArr = []
        })
        return {
            submitForm
        }
    }
})
</script>